Thorium in cameras

Author: svuy

August undefined, 2024

WebJun 8, 2007 · 5.3k. Posted May 20, 2007. The only lens I have ever heard of in the Canon FD line up with the Thorium element is the first four versions of the 35mm f2.0. The first chrome nose versions are always Thorium and those later marked S.S.C. with the concave front element are also Thorium. There is an excellent write on these on the Canon FD FAQ … WebSep 29, 2024 · Older camera lenses: some camera lenses from the 1950s-1970s incorporated thorium into the glass, allowing for a high refractive index while maintaining a low dispersion. The health risk from using older camera lenses is low; the radiation received when using a thoriated lens camera is approximately equal to natural background.

Thorium - Element information, properties and uses Periodic Table

WebRadioactive lenses. Many lenses produced from the 1940s through the 1980s are measurably radioactive. The main source of radioactivity is the use of thorium oxide (up … WebNov 20, 2024 · Lenses That May Contain Thorium or Lanthanum. Kodak Ektanar 50mm f/2.8 (Kodak Signet 80 camera) lens mfg. 1958-1962 (3 examples) Kodak Ektanar, 44mm f/2.8 (Kodak Signet 30, Kodak Signet 50, Kodak Automatic 35/Motormatic 35 cameras) lenses mfg. 1959-1969. dropped seat stays

Thorium in Takumar/Pentax 105 f/2.4 - PentaxForums.com

http://forum.mflenses.com/removing-thorium-yellowing-with-a-uv-light-t82343.html WebGamma ray logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other related purposes. [1] WebMar 26, 2016 · hello! i have a question about Thorium in Pentax 67 system i know that Thorium is in the old 105mm f2.4 lenses ... It's good to know that Pentax also manufactures lenses for medical equipment not just cameras, some which use to contain Thorium. I'm pretty sure the medical community would be up in arms by now if there was really ... dropped seagate external hard drive beeping

Rare Earth Glass Leica Lenses: A Quick and Quirky Overview

Older lenses with THORIUM element - Canon FD Mount - Photo.net

WebFurthermore, thorium dioxide is utilized in many ceramics and glasswork applications. Thorium dioxide is known to increase refractive index in glass, thus has many applications in optical lenses for cameras and scientific apparatuses. Thorium fluoride is used as an optical coating, and the list goes on. WebApr 17, 2013 · Another idea: mix a thorium-plutonium liquid in a molten salt reactor: Turning Japan's nuclear past into its future Or you could put liquid uranium and nuclear waste into a molten salt reactor: dropped screw in maytag dishwasherWebJan 23, 2024 · Wolfgang: If I need a quick, highly responsive camera, i.e., for an event, I use the top-of-the-line Nikon DSLRs or the F5 for film. For my personal photography and slower-paced shoots, I use a ... droppedshoulder poodle sweatshirt

"WebThorium is a member of the actinide series, and decays by alpha emission with a very long half-life. ... Taylor et al. (1983) measured the absorbed dose rate at the back of a camera and the thorium content of the lens. The thorium in the … " - Thorium in cameras

Thorium in cameras

Nikon Thorium Glass... how long? - Digital Photography Review

WebCamera lenses known to have contained thorium include: Canon FL 58mm f1.2 GAF Anscomatic 38mm f2.8 (Anscomatic 726 camera) Kodak Ektanar 38mm f2.8 (Instamatic 804 camera) Kodak Ektanon 46mm f3.5 (Signet 40 camera) Kodak Ektanon 50mm f3.9 … http://www.diva-portal.org/smash/get/diva2:652338/FULLTEXT01.pdf

Did you know?

WebThorium is a radioactive substance that occurs naturally in the environment. It has been shown to cause an increase in cancers of the lung, pancreas, and blood in workers exposed to high levels of it in the air. This chemical has been found in at least 16 of the 1,177 National Priorities List sites identified by the Environmental Protection Agency (EPA). WebOct 11, 2012 · A Look at the Radioactivity of Old Manual Lenses. Oct 11, 2012. Michael Zhang. Radioactive Lens -- Pentax 50mm f/1.4 S-M-C Takumar. Watch on. YouTube user uyt384 does tests on old camera lenses ...

WebFeb 15, 2024 · Glass containing thorium oxide has both a high refractive index and wavelength dispersion, and is used in high quality lenses for cameras and scientific instruments. Another thorium compound, thorium fluoride (ThF 4), is used in carbon arc lamps for movie projectors and searchlights. WebOct 18, 2024 · The tropical beaches of India probably bring to mind sun-dappled palms, fiery fish curries and dreadlocked backpackers, but they also hold a surprising secret. Their sands are rich in thorium ...

WebThorium is a member of the actinide series, and decays by alpha emission with a very long half-life. ... Taylor et al. (1983) measured the absorbed dose rate at the back of a camera … WebAug 29, 2024 · Multi Format. Aug 28, 2024. #2. Thorium emits alpha radiation. In air, alpha radiation can travel about an inch or so and cannot penetrate human skin so thorium …

WebNOTE: Thorium doped telescope eyepieces contain high levels of thorium (25%) and will cause damage to the cornea. Lenses That May Contain Thorium or Lanthanum. Kodak Ektar 101mm f/4.5 (Miniature Crown Graphic camera) lens mfg. 1946. Kodak Ektar 38mm f/2.8 (Kodak Instamatic 814 camera) lens mfg 1968-1970.

WebOct 12, 2024 · Thorium dioxide has a 30-50% higher refractive index than typical glasses which translates into some combination of less-curved (thinner) elements or greater bending of light to produce more compact lenses of a given focal length and aperture. Kodak, Yashica, Mamiya, (and of course, Asahi), among others used thorium glass. dropped shipped meaningWebsium-40 or thorium-232 to be detectable with a survey meter. Older camera lenses (1950s-1970s) often em-ployed coatings of thorium-232 to alter the index of re-fraction. It is safe to eat from this glassware. (HPS ATE 3167) Fertilizer Commercial fertilizers are designed to provide varying levels of potassium, phosphorous, and nitrogen. Such dropped shorts on beachWebDuring 2007-08 Geoscience Australia carried out a small thorium project to acquire: an improved understanding of the status and distribution of Australia's thorium resources for use in the determination of government policy and industry investment decisions. a better understanding of the geochemistry of the thorium cycle in the Earth's crust. dropped shirtWebi scored this lovely old camera at a flea market. the lens partly consists of the radioactive element thorium.by adding thorium to the lens glass, a high ref... dropped shoulder top with shirt collar collagen tablets are they good for youWebJun 7, 2024 · A Radioactive Lens. Between the 1940s and 1970s, a number of camera manufacturers designed lenses employing thoriated glass in one or more elements. … collagen synthesis vitamin eWebThe reason for having thorium is to improve the quality of light passing through the lens by allowing it to pass through the glass more quickly. The yellow tint inhibits the ability for … collagen tablets and high blood pressure